Analysis of long-term observations of four weak-line T Tauri stars

Details Analysis of long-term observations of four weak-line T Tauri stars Analysis of long-term observations of four weak-line T Tauri stars

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998astl...24..497g&link_type=abstract

Astronomy Letters, Volume 24, Issue 4, July 1998, pp.497-506; Pis'ma v Astronomicheskii Zhurnal, Vol. 24, p. 580

Astronomy and Astrophysics

Astronomy

4

Scientific paper

We present the results of seven-year-long BVR observations of four T Tauri stars at Mount Maidanak. V819 Tau, V827 Tau, V830 Tau, and V836 Tau are shown to exhibit periodic light variations attributable to the nonuniform distribution of extended spotted regions over the stellar surface. We confirm that the initial epoch of the periodic light curves is stable over a period of 4 to 7 years. A method of calculating upper limits on the main parameters of spotted regions is proposed. We have established that the extended spotted regions can occupy from 44 to 90% of the entire stellar surface and that their mean temperature is lower than the photospheric temperature by 550-850 K. The mechanisms for changes in the amplitude and shape of the periodic light curves are discussed.

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